In the Library of Congress Classification System, books will be in the History section under “E.”
E 101-135 Discovery of America and early explorations
E 186-199 Colonial history (1607-1775)
E 201-298 The Revolution, 1775-1783
E 337.5-453 Early nineteenth century
E 456-655 Civil War period, 1861-1865
E 660-738 Late nineteenth century, 1865-1900
E 740-889 Twentieth century
E 895-904 Twenty-first century